1 | /* |
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2 | * |
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3 | * Copyright (c) 2015 University of York. |
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4 | * Hesham ALMatary <hmka501@york.ac.uk> |
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5 | * |
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6 | * COPYRIGHT (c) 1989-2006. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * Redistribution and use in source and binary forms, with or without |
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10 | * modification, are permitted provided that the following conditions |
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11 | * are met: |
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12 | * 1. Redistributions of source code must retain the above copyright |
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13 | * notice, this list of conditions and the following disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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28 | * SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | #ifdef HAVE_CONFIG_H |
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32 | #include "config.h" |
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33 | #endif |
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34 | |
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35 | #include <string.h> |
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36 | |
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37 | #include <rtems/score/cpu.h> |
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38 | #include <rtems/score/interr.h> |
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39 | |
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40 | void _CPU_Context_Initialize( |
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41 | Context_Control *context, |
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42 | void *stack_area_begin, |
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43 | size_t stack_area_size, |
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44 | uint32_t new_level, |
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45 | void (*entry_point)( void ), |
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46 | bool is_fp, |
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47 | void *tls_area |
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48 | ) |
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49 | { |
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50 | uintptr_t stack = ((uintptr_t) stack_area_begin); |
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51 | uint32_t sr, iret; |
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52 | |
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53 | /* Account for red-zone */ |
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54 | uintptr_t stack_high = stack + stack_area_size - EPIPHANY_GCC_RED_ZONE_SIZE; |
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55 | |
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56 | asm volatile ("movfs %0, status \n" : "=r" (sr):); |
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57 | asm volatile ("movfs %0, iret \n" : "=r" (iret):); |
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58 | |
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59 | memset(context, 0, sizeof(*context)); |
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60 | |
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61 | context->r[11] = stack_high; |
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62 | context->r[13] = stack_high; |
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63 | context->r[14] = (uintptr_t) entry_point; |
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64 | context->status = sr; |
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65 | context->iret = iret; |
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66 | } |
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